[Android,Cast] Report correctly when devices are not available.

chrome/android/junit/src/org/chromium/chrome/browser/media/router/cast/CastMediaRouteProviderTest.java

Index: chrome/android/junit/src/org/chromium/chrome/browser/media/router/cast/CastMediaRouteProviderTest.java
diff --git a/chrome/android/junit/src/org/chromium/chrome/browser/media/router/cast/CastMediaRouteProviderTest.java b/chrome/android/junit/src/org/chromium/chrome/browser/media/router/cast/CastMediaRouteProviderTest.java
new file mode 100644
index 0000000000000000000000000000000000000000..04578c6842daf99d312fa95f16b3549b8b53c4dc
--- /dev/null
+++ b/chrome/android/junit/src/org/chromium/chrome/browser/media/router/cast/CastMediaRouteProviderTest.java
@@ -0,0 +1,65 @@
+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.chrome.browser.media.router.cast;
+
+import static org.mockito.ArgumentMatchers.eq;
+import static org.mockito.ArgumentMatchers.same;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.timeout;
+import static org.mockito.Mockito.verify;
+
+import android.support.v7.media.MediaRouter;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.robolectric.annotation.Config;
+
+import org.chromium.base.test.util.Feature;
+import org.chromium.chrome.browser.media.router.ChromeMediaRouter;
+import org.chromium.chrome.browser.media.router.MediaRouteManager;
+import org.chromium.testing.local.LocalRobolectricTestRunner;
+
+import java.util.ArrayList;
+
+/**
+ * Robolectric tests for {@link CastMediaRouteProvider}.
+ */
+@RunWith(LocalRobolectricTestRunner.class)
+@Config(manifest = Config.NONE)
+public class CastMediaRouteProviderTest {
+    private static final String SUPPORTED_SOURCE =
+            "https://google.com/cast/#__castAppId__=DEADBEEF";
+    private static final String UNSUPPORTED_SOURCE = "https://example.com";
+
+    @Test
+    @Feature({"MediaRouter"})
+    public void testStartObservingMediaSinksNoMediaRouter() {
+        ChromeMediaRouter.setAndroidMediaRouterForTest(null);
+
+        MediaRouteManager mockManager = mock(MediaRouteManager.class);
+        CastMediaRouteProvider provider = CastMediaRouteProvider.create(mockManager);
+
+        provider.startObservingMediaSinks(SUPPORTED_SOURCE);
+
+        verify(mockManager, timeout(100))
+                .onSinksReceived(
+                        eq(SUPPORTED_SOURCE), same(provider), eq(new ArrayList<MediaSink>()));
+    }
+
+    @Test
+    @Feature({"MediaRouter"})
+    public void testStartObservingMediaSinksUnsupportedSource() {
+        ChromeMediaRouter.setAndroidMediaRouterForTest(mock(MediaRouter.class));
+
+        MediaRouteManager mockManager = mock(MediaRouteManager.class);
+        CastMediaRouteProvider provider = CastMediaRouteProvider.create(mockManager);
+
+        provider.startObservingMediaSinks(UNSUPPORTED_SOURCE);
+
+        verify(mockManager, timeout(100))
+                .onSinksReceived(
+                        eq(UNSUPPORTED_SOURCE), same(provider), eq(new ArrayList<MediaSink>()));
+    }
+}